Handle the case when derived constructor is [[Call]]ed with 0 args.

Handle the case when derived constructor is [[Call]]ed with 0 args.

ArgumentsAdaptorStub for derived constructor (the one that needs
new.target) works in this way:
 - If the constructor is invoked via the Construct stub, we know that
   actual arguments always include new.target. ``arguments`` object
   however should not include a new.target, therefore we remove it.
   We achieve this by decrementing the argument count.
 - If the constructor is invoked as a call, we do not care for a correct
   ``arguments`` array since the constructor will immediately throw on
   entrance.
The bug is that the call could actually pass 0 actual arguments, but I
decrement unconditionally :(. The fix is to detect this case and avoid
decrementing. ``arguments`` is bogus, but it is ok as constructor
throws.

Long-term we should just remove mucking about with arguments for
new.target and just get it from the stack.

R=arv@chromium.org,rossberg@chromium.org
BUG=chromium:474783
LOG=Y

Committed: https://crrev.com/cf53fed972896bf23c037ce7ac9f8e1512463c62
Cr-Commit-Position: refs/heads/master@{#28242}

[Dmitry Lomov (no reviews), 2015-05-05 17:10:42]

PTAL

[Dmitry Lomov (no reviews), 2015-05-05 17:10:49]

The CQ bit was checked by dslomov@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-05-05 17:11:21]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1126783003/1

[arv (Not doing code reviews), 2015-05-05 17:53:56]

LGTM

[commit-bot: I haz the power, 2015-05-05 18:06:04]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-05-05 18:06:05]

Dry run: This issue passed the CQ dry run.

[Dmitry Lomov (no reviews), 2015-05-05 19:55:01]

The CQ bit was checked by dslomov@chromium.org

[commit-bot: I haz the power, 2015-05-05 19:55:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1126783003/1

[commit-bot: I haz the power, 2015-05-05 19:57:03]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-05 19:57:16]

Patchset 1 (id:??) landed as
https://crrev.com/cf53fed972896bf23c037ce7ac9f8e1512463c62
Cr-Commit-Position: refs/heads/master@{#28242}